2006

7.0

2004

4.6

2003

6.0

2005

6.0

1990

4.0

1986

4.8

1989

4.5

2004

7.2

1977

3.3

2013

6.1

1994

3.7

2002

1.0

1995

4.7

2001

6.7

1975

5.5

1971

5.8

1981

2.3

2013

4.8

1987

5.0

2008

6.1